Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b162097ecc0959…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 07:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 271d6ca2b20405e9aebeac15812a8299 SHA-1: f32c67aa6d4e859e9fbe2c45a431597b3716bc7b SHA-256: e8b162097ecc0959dbd895f298413cfb9e36239537ac1744be39739cbee7d1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf5a7c370---90090703276.pdf In PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090418213063.pdfIn PDF document text
    • http://saimiri.name/upload/file/vekol.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec045da---38929447036.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/mipufufet.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/10607647921.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fuguzubamepot.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea7a9efb5---wagojumezajeped.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/32101036167.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/3304344644.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/gibawimotewabipusaju.pdfIn PDF document text
    • https://edusfera.pl/upload/file/40925662793.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/menopufoduzubitunefigeta.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/67194620611.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/dumexutuwosud.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vejeviwefuri.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/fuzifapigi.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/gotaruponokidimegaribilez.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/6950151663.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/reroditekewudupavup.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e3496d887abbfecde01cc3026454522e/vovopememikusorevawogox.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/61629431492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=zombie+idle+defense+best+heroesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 19656 bytes
SHA-256: 949874c825daf5edc0f8e16f049de6a14e6361613b603c19a4a61fc115e1bd93
font_01_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 10560 bytes
SHA-256: 703ef99c13f026ac2c2ac6a66654ef980aa1066dc2e173e67cf28e92c3f28709